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GL852GT is Genesys Logic’s premium 4-port hub solution which fully complies with Universal Serial Bus Specification Revision 2.0, and it especially targets for special applications which require operating temperature -40°C to 85°C. GL852GT implements multiple TT* (Note1) architecture that provide dedicated TT* to each downstream (DS) ports, which guarantee Full-Speed(FS) data passing bandwidth when multiple FS device perform heavy loading operations.  The controller inherits Genesys Logic’s cutting edge technology on cost and power efficient serial interface design. GL852GT has proven compatibility, lower power consumption figure and better cost structure above all USB2.0 hub solutions worldwide.

GL852GT implements multiple hub configuration features onto internal mask ROM, which traditionally requires one external EEPROM. The microprocessor detects general purpose I/O (GPIO) status during the initial stage to configure hub settings such as (1) number of DSport, (2) declare of compound device (3) gang/individual mode selection…etc.  External EEPROM can be removed if no vendor specified PID/VID or product string is required for the application.

GL852GT supports LQFP48 package type, provides full hub features such as (1) two-color (green/amber) status LEDs for each DS ports, (2) Individual/Gang mode power management scheme that indicates DS port over-current events. (3) Number of DS ports setting configured by GPIO setting (4) non-removable declaration configured by GPIO setting (5) Support both 93C46 and 24C02 EEPROM (6) power switch polarity selections…etc. QFN28 package supports only partial hub features but provides smaller footprint that targets space limited PCB layout environments such as embedded system or UMPC/MID applications.


# of DS
Port # 
Power mgmt. LED support EEPROM
LQFP 48 4 EEPROM/GPIO EEPROM/GPIO Individual/Gang Green/Amber 93C46/ 24C02
QFN 28 4 EEPROM EEPROM Individual/Gang N/A 24C02

 *Note 1: TT (transaction translator) is the main traffic control engine in an USB 2.0 hub to handle the unbalanced traffic speed between the upstream port and the downstream ports.


•    Compliant to USB specification Revision 2.0
      -    4 downstream ports
      -    Upstream port supports both high-speed (HS) and full-speed (FS) traffic
      -    Downstream ports support HS, FS, and low-speed (LS) traffic
      -    1 control pipe (endpoint 0, 64-byte data payload) and 1 interrupt pipe (endpoint 1, 1-byte data payload)
      -    Backward compatible to USB specification Revision 1.1
•      On-chip 8-bit micro-processor
      -    RISC-like architecture
      -    USB optimized instruction set
      -    Dual cycle instruction execution
      -    Performance: 6 MIPS @ 12MHz
      -    With 64-byte RAM and 2K internal ROM
      -    Support customized PID, VID by reading external EEPROM
      -    Support downstream port configuration by reading external EEPROM
•      Multiple Transaction translator (MTT)
      -    MTT provides respective TT control logics for each downstream port.
•     Flexible design
      -    Support compound-device (non-removable in downstream ports) by I/O pin configuration (Only available in LQFP48 package)
      -    Number of Downstream port can be configured by GPIO without external EEPROM (Only available in LQFP48 package)
      -    Support both individual and gang modes of power management and over-current detection for downstream ports
      -    Each downstream port supports two-color status indicator, with automatic and manual modes compliant to USB specification Revision 2.0
      -    Automatic switching between self-powered and bus-powered modes. Conform to bus power requirements of USB 2.0 specification
      -    Optional 27/48 MHz Oscillator clock input (Only available in LQFP48 package)
•     Low BOM cost
      -    Built-in 5V to 3.3V regulator
      -    Built-in upstream port 1.5KΩ pull-up and downstream port 15KΩ pull-down resistors
      -    Embedded PLL support external 12 MHz crystal / Oscillator clock input
•    Integrate USB2.0 transceiver
      -    Improve output drivers with slew-rate control for EMI reduction
      -    Internal power-fail detection for ESD recovery
•      Support operating temperature: -40°C~85°C
•      Available package types:
      -    48 pin LQFP,
      -    28 pin QFN
•     Applications:
      -    Stand-alone USB hub / USB docking
      -    UMPC/MID, motherboard on-board applications
      -    Consumer electronics built-in hub application
      -    Monitor built-in hub
      -    Embedded systems
      -    Compound device to support USB hub function such as keyboard hub applications


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